Go bold and bright. Get out and explore the great outdoors!In a first ever for a Casio timepiece, Neo-Brite phosphorescence is integrated into the solar dial design of the PRO TREK PRW-61LD to create a display that glows a soft green in the dark. Combined with blue luminescence on the index marks and hour, minute, and seconds hands, this PRO TREK delivers even greater visibility for the enhanced readability that your nighttime adventures require.The case, band, and case back are made with bio-based resin, in keeping with the PRO TREK commitment to reducing environmental impact by using sustainable materials.Delivering on outdoor utility, the model is equipped with Triple Sensor (digital compass, barometer/altimeter, and thermometer), as well as Multi-Band 6 radio wave reception from 6 transmission stations around the world, and Tough Solar to provide stable power for these functions and more. For optimum readability, the design features thick bar indexes to check time, direction, and other indicators at a glance, as well as slits on the band above and below the dial that serve as guides to quickly read the compass direction indicated by the second hand.Case size (L× W× H)51 × 47.4 × 14.7 mmWeight53 gCase and bezel materialBio-based Resin / Stainless steel BandSoft urethane band (Bio-based resin)Water resistance100-meter water resistanceEnvironmental resistanceLow-temperature resistant (-10℃/14℉)Time adjustmentRadio-controlled Watch; Multi band 6Power supply and battery lifeTough Solar (Solar powered)Sensor featureDigital compassMeasures and displays direction as one of 16 pointsMeasuring range: 0 to 359°Measuring unit: 1°60 seconds continuous measurementHand indication of northBidirectional calibrationMagnetic declination correctionAltimeterMeasuring range: -700 to 10,000 m ( -2,300 to 32,800 ft.)Measuring unit: 1 m (5 ft.)Hand indication of altitude differentialManual memory measurements (up to 30 records, each including altitude, date, time)Auto log data (High/low altitudes, cumulative ascent and descent)Others: Relative altitude readings (±100m /±1000m),Selectable measurement interval: 5 seconds or 2 minutes*1 second for first 3 minutes only*Changeover between meters (m) and feet (ft)BarometerDisplay range: 260 to 1,100 hPa (7.65 to 32.45 inHg)Display unit: 1 hPa (0.05 inHg)Hand indication of pressure differentialAtmospheric pressure tendency graphBarometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)*Changeover between hPa and inHgThermometerDisplay range: -10 to 60℃ (14 to 140℉)Display unit: 0.1℃ (0.2℉)*Changeover between Celsius (℃) and Fahrenheit (℉)ExteriorGlassMineral GlassCrownScrew Lock CrownSurface treatmentBlack ion plated bezelCompatible band size145 to 215 mmOtherNeobriteWatch FeaturesWorld time29 time zones (29 cities + coordinated universal time), One-touch UTC Time Zone Access, daylight saving on/off, Home city/World time city swappingStopwatch1/100-second stopwatchMeasuring capacity: 23:59'59.99''Measuring modes: Elapsed time, split time, 1st-2nd place timesTimerCountdown timerMeasuring unit: 1 secondCountdown range: 60 minutesCountdown start time setting range: 1 minute to 60 minutes (1-minute increments)Alarm/hourly time signal5 daily alarmsHourly time signalLightDouble LED lightLED light for the face (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)Light colourLED:WhiteCalendarFull auto-calendar (to year 2099)Mute featureButton operation tone on/offHand home position correction featureThe auto hand home position correcti